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- <STRONG>form_field_validation</STRONG> - data type validation for fields
-
-
-</PRE>
-<H2>SYNOPSIS</H2><PRE>
- <STRONG>#include</STRONG> <STRONG><form.h></STRONG>
- int set_field_type(FIELD *field, FIELDTYPE *type, ...);
- FIELDTYPE *field_type(const FIELD *field);
- void *field_arg(const FIELD *field);
-
-
-</PRE>
-<H2>DESCRIPTION</H2><PRE>
- The function <STRONG>set_field_type</STRONG> declares a data type for a
- given form field. This is the type checked by validation
- functions. The types are as follows:
-
- TYPE_ALNUM
- Alphanumeric data. Requires a third <STRONG>int</STRONG> argument, a
- minimum field width.
-
- TYPE_ALPHA
- Character data. Requires a third <STRONG>int</STRONG> argument, a
- minimum field width.
-
- TYPE_ENUM
- Accept one of a specified set of strings. Requires a
- third <STRONG>(char</STRONG> <STRONG>**)</STRONG> argument pointing to a string list; a
- fourth <STRONG>int</STRONG> flag argument to enable case-sensitivity;
- and a fifth <STRONG>int</STRONG> flag argument specifying whether a
- partial match must be a unique one (if this flag is
- off, a prefix matches the first of any set of more
- than one list elements with that prefix). Please
- notice that the string list is not copied, only a
- reference to it is stored in the field. So you should
- avoid to use a list that lives in automatic variables
- on the stack.
-
- TYPE_INTEGER
- Integer data, parsable to an integer by <STRONG>atoi(3)</STRONG>.
- Requires a third <STRONG>int</STRONG> argument controlling the preci-
- sion, a fourth <STRONG>long</STRONG> argument constraining minimum
- value, and a fifth <STRONG>long</STRONG> constraining maximum value.
- If the maximum value is less or equal the minimum
- value, the range is simply ignored. On return the
- field buffer is formatted according to the <STRONG>printf</STRONG>
- format specification ".*ld", where the '*' is
- replaced by the precision argument. For details of
- the precision handling see <STRONG>printf's</STRONG> man-page.
-
- TYPE_NUMERIC
- Numeric data (may have a decimal-point part).
- Requires a third <STRONG>int</STRONG> argument controlling the preci-
- sion, a fourth <STRONG>double</STRONG> argument constraining minimum
- value, and a fifth <STRONG>double</STRONG> constraining maximum value.
- If your system supports locale's, the decimal point
- the minimum value, the range is simply ignored. On
- return the field buffer is formatted according to the
- <STRONG>printf</STRONG> format specification ".*f", where the '*' is
- replaced by the precision argument. For details of
- the precision handling see <STRONG>printf's</STRONG> man-page.
-
- TYPE_REGEXP
- Regular expression data. Requires a regular expres-
- sion <STRONG>(char</STRONG> <STRONG>*)</STRONG> third argument; the data is valid if
- the regular expression matches it. Regular expres-
- sions are in the format of <STRONG><A HREF="regcomp.3x.html">regcomp(3X)</A></STRONG> and
- <STRONG><A HREF="regexec.3x.html">regexec(3X)</A></STRONG>. Please notice that the regular expres-
- sion must match the whole field. If you have for
- example an eight character wide field, a regular
- expression "^[0-9]*$" always means that you have to
- fill all eight positions with digits. If you want to
- allow fewer digits, you may use for example "^[0-9]*
- *$" which is good for trailing spaces (up to an empty
- field), or "^ *[0-9]* *$" which is good for leading
- and trailing spaces around the digits.
-
- TYPE_IPV4
- An Internet Protocol Version 4 address. This requires
- no additional argument. It is checked whether or not
- the buffer has the form a.b.c.d, where a,b,c and d
- are numbers between 0 and 255. Trailing blanks in the
- buffer are ignored. The address itself is not vali-
- dated. Please note that this is an ncurses extension.
- This field type may not be available in other curses
- implementations.
-
- It is possible to set up new programmer-defined field
- types. See the <STRONG><A HREF="form_fieldtype.3x.html">form_fieldtype(3X)</A></STRONG> manual page.
-
-
-</PRE>
-<H2>RETURN VALUE</H2><PRE>
- The functions <STRONG>field_type</STRONG> and <STRONG>field_arg</STRONG> return <STRONG>NULL</STRONG> on
- error. The function <STRONG>set_field_type</STRONG> returns one of the fol-
- lowing:
-
- <STRONG>E_OK</STRONG> The routine succeeded.
-
- <STRONG>E_SYSTEM_ERROR</STRONG>
- System error occurred (see <STRONG>errno</STRONG>).
-
-
-</PRE>
-<H2>SEE ALSO</H2><PRE>
- <STRONG><A HREF="ncurses.3x.html">curses(3X)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3X)</A></STRONG>.
-
-
-</PRE>
-<H2>NOTES</H2><PRE>
- The header file <STRONG><form.h></STRONG> automatically includes the header
- file <STRONG><curses.h></STRONG>.
-
-
-</PRE>
-<H2>PORTABILITY</H2><PRE>
-
-
-</PRE>
-<H2>AUTHORS</H2><PRE>
- Juergen Pfeifer. Manual pages and adaptation for new
- curses by Eric S. Raymond.
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